Homework Help: stat math

Posted by helga on Sunday, February 1, 2009 at 9:56pm.

Stat hw question help me please?
In a high profile murder case a sample of the general public's opinions concerning the guilt or innocence of the defendant is taken. A sample of n=100 males results in 62% of the respondents beliving that the defendant is guilty, while a sample of 120 females results in 58% of the respondents beliving that the defendant is guilty.
A. calculate a 95% confidence interval for the percentage of males who believ that the defedant is guilty.

b. calculate a 95% confidence interval for the percentage of females who believe that the defendant is guilty.

c. based on a and b , does it appear that a majority of both males and females believed the defendant is guilty?

stat math - economyst, Monday, February 2, 2009 at 1:31pm
Calculate the standard deviation.
SD = sqrt(p*q/n) = sqrt(.62*.38/100) = .0485.
95% confidence interval (use alpha=1.96) -- ranges between .62+.0485*1.96 and .62-.0485*1.96

Repeat for females.

Answer this Question

Related Questions

statistics - survey revealed two percent of students did not select stat. for ...
Stat B - How many standard deviations away from the mean do the quartiles lie in...
stat. - A sample consists of the following n 6 scores: 2, 7, 4, 6, 4, and 7...
stat - A sample consists of the following data 7,11,12,18,20,22,25. What is the ...
stat - Find the sample variance s2 for the following sample data. Round your ...
stat - ok there was a question that my teacher told me i got wrong the question ...
business stat - 1. Suppose quality control inspectors at the coffee house chain...
Stat Help - A researcher wishes to be 95% confident that her estimate of the ...
Stat - the teacher wants me to make a survey questions about a sample and get a ...
stat - I posted a question but never got an answer.

For Further Reading

First Name:
School Subject:
Answer: